I grabbed these O-rings to add to my WE XDM magazines (there were no rings present). Initially I was concerned that the O-rings may fall out but they fit very snugly. After prodding them into place with tweezers I found the best way to seat them was using a gas fill adapter but being careful not to pinch the O-rings on the edge of the valve's conical inlet.
After installation, filling the mags was silent with no leakage. With a silent fill I was confident that I was completely filling the mags as I could actually hear when the gas stopped flowing (ie. pressure equalized)!
What can I say besides 4 thumbs up for these O-rings!
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